in lance armstrong's case. >> perhaps narcissistic behavior. if it's in my strategic advantage to lie i will do so. >> reporter: in teo's case which is still growing. >> that seems to be more of saving face. >> reporter: we also asked you what motivates people to lie. >> there's a lot of to be gained from lying. especially lance armstrong. >> being a cyclist myself i think he's a big enough victim just like the rest of the cycling world. >> he was probably scared. i would like too if i was scared. >> there was probably one lie and then you had to lie after that. >> reporter: most people will like to give armstrong a second chance quote with all the carnage along the way. >>> now to washington, d.c. where crews were busy preparing for president obama's inauguration. last minute prep is on the way. he'll be sworn in on sunday in a private white house ceremony. then the president will take his oath at a public event on monday. an estimated 800,000 people will attend the public inauguration. but that's down from a record 1.8 million in 2008. >>> on